Simon and Fabian went to buy computers at a sale. The usual price of 1 computer was $1600 each.

SALE
Buy 1 computer at 20% discount
Buy 2 or more computers at 25% discount each

1. Simon bought 1 computer. How much did he pay?
2. What is the maximum number of computers Fabian can buy if he has $3000?

(a)
Discounted price of 1 computer in percent if only 1 was bought
= 100% - 20%
= 80%

100% of 1 computer = 1600
1% of 1 computer = 1600 ÷ 100 = 16
80% of 1 computer = 80 x 16 = 1280 

Amount that Simon paid for 1 computer = $1280

(b)
Discounted price of 1 computer in percent if more than 1 was bought
= 100% - 25%
= 75%

75% of 1 computer = 75 x 16 = 1200

Amount that Fabian paid for 1 computer = $1200

Maximum number of computers that Fabian can buy if he has $3000
= 3000 ÷ 1200
= 2 r 600

Answer(s): (a) $1280; (b) 2